//删除cookie
function delCookie(c_name){
  var exp = new Date();
  exp.setTime(exp.getTime() - 1);
  var cval = getCookie(c_name);
  if (cval != null) {
      document.cookie = c_name + "=" + cval + ";" +
          "expires=" + exp.toGMTString();
  }
}
//获取cookie值得函数
function getCookie(c_name) {
  if (document.cookie.length>0)
  {
    var c_start=document.cookie.indexOf(c_name + "=");
    if (c_start!=-1)
    {
      c_start=c_start + c_name.length+1
      var c_end=document.cookie.indexOf(";",c_start);
      if (c_end==-1) c_end=document.cookie.length;
      return unescape(document.cookie.substring(c_start,c_end))
    }
  }
  return ""
}
export { delCookie, getCookie }